1. 40 42 Warm up Solve for the variable. 1. 2. 4x – 20 x 2y + 28

2. Quiz Review

3. Congruent Triangles

4. Congruent triangles have 3 congruent sides and 3 congruent angles.
Informal Geometry
9/13/2018
Congruent Triangles
Congruent triangles have 3 congruent sides and 3 congruent angles.
The parts of congruent triangles that “match” are called corresponding parts.

5. ORDER MATTERS!!!! In a congruence statement Everything matches up.
Informal Geometry
9/13/2018
Congruence Statement
In a congruence statement
ORDER MATTERS!!!!
Everything matches up.

6. Corresponding Parts of Congruent Triangles are Congruent
CPCTC
Corresponding Parts of Congruent Triangles are Congruent

7. Complete each congruence statement.B
If ABC  DEF,
then BC  ___ EF A C D F E

8. Complete each congruence statement.B
If ABC  DEF,
then A  ___ D A C D F E

9. Complete each congruence statement.B
If ABC  DEF,
then C  ___ F A C D F E

10. Fill in the blanks
If CAT  DOG,
then AC  ___ OD

11. BAT  MON N T  ___ _____  ONM _____  MO ATB NM  ____ BA TB
Fill in the blanks
BAT  MON N
T  ___
_____  ONM
_____  MO
NM  ____
ATB BA TB

12. Fill in the blanks
BCA   ____
____   GFE
EGF
CAB

13. Complete the congruence statement.
MKL
_____   JKN

14. Complete the congruence statement.
ABD
_____   CBD

15. 5 ways to Prove Triangles Congruent

16. Side-Angle-Side (SAS) Congruence Postulate
Two sides and the INCLUDED angle
(the angle is in between the 2 marked sides)

17. Angle-Side-Angle (ASA) Congruence Postulate
Two angles and the INCLUDED side
(the side is in between the 2 marked angles)

18. Two Angles and One Side that is NOT included
Angle-Angle-Side (AAS) Congruence Postulate A S A S
Two Angles and One Side that is NOT included

19. There is one more way to prove triangles congruent, but it’s only for RIGHT TRIANGLES…Hypotenuse LegHL

20. Your Only Ways To Prove Triangles Are Congruent
SSS
SAS
ASA
AAS HL
NO BAD WORDS
Your Only Ways To Prove Triangles Are Congruent

21. Side-Side-Side (SSS) Congruence Postulate
All Three sides in one triangle are congruent to all three sides in the other triangle

22. 4 markings YOU can add if they aren’t marked already

23. Share a side Vertical Angles Reason: Reflexive Property
Reason: Vertical Angles are congruent

24. Alternate Interior Angles
Reason: Alt. Int angles are congruent

25. Opposite congruent sides are congruent angles.
Isosceles Triangle
Opposite congruent sides are congruent angles.